12212303221 has 2 divisors, whose sum is σ = 12212303222. Its totient is φ = 12212303220.

The previous prime is 12212303203. The next prime is 12212303227. The reversal of 12212303221 is 12230321221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11744056900 + 468246321 = 108370^2 + 21639^2 .

It is a cyclic number.

It is not a de Polignac number, because 12212303221 - 2¹⁵ = 12212270453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12212303227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6106151610 + 6106151611.

It is an arithmetic number, because the mean of its divisors is an integer number (6106151611).

Almost surely, 2^12212303221 is an apocalyptic number.

It is an amenable number.

12212303221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12212303221 is an equidigital number, since it uses as much as digits as its factorization.

12212303221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 12212303221 its reverse (12230321221), we get a palindrome (24442624442).

The spelling of 12212303221 in words is "twelve billion, two hundred twelve million, three hundred three thousand, two hundred twenty-one".